diff --git a/src/connector/jdbc/pom.xml b/src/connector/jdbc/pom.xml
index 5ca5e96a84157def62292756c4949bbe2c904500..0626bcf1fb1161cc38ad05002b984b2200b68d68 100755
--- a/src/connector/jdbc/pom.xml
+++ b/src/connector/jdbc/pom.xml
@@ -123,7 +123,7 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.12.4</version>
                 <configuration>
-                    <forkMode>pretest</forkMode>
+                    <forkMode>pertest</forkMode>
                     <argLine>${maven.test.jvmargs}</argLine>
                     <includes>
                         <include>**/*Test.java</include>
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
index 9b387b1959ba032aa9a84f5ad70bcebbbe3d0649..349a02fb37c28b263bb73bcc05f644bc53f71079 100755
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
@@ -16,9 +16,6 @@ package com.taosdata.jdbc;
 
 import com.taosdata.jdbc.utils.TaosInfo;
 
-import javax.management.MBeanServer;
-import javax.management.ObjectName;
-import java.lang.management.ManagementFactory;
 import java.sql.SQLException;
 import java.sql.SQLWarning;
 import java.util.List;
@@ -31,7 +28,6 @@ public class TSDBJNIConnector {
     static {
         System.loadLibrary("taos");
         System.out.println("java.library.path:" + System.getProperty("java.library.path"));
-
     }
 
     /**
@@ -109,9 +105,7 @@ public class TSDBJNIConnector {
             throw new SQLException(TSDBConstants.WrapErrMsg(this.getErrMsg(0L)), "", this.getErrCode(0l));
         }
         // invoke connectImp only here
-        int open = taosInfo.getOpen_count().incrementAndGet();
-        int close = taosInfo.getClose_count().get();
-        System.out.println("open_count: " + open + ", close_count: " + close + ", connection_count: " + (taosInfo.getConnectionCount()));
+        taosInfo.conn_open_increment();
         return true;
     }
 
@@ -132,6 +126,7 @@ public class TSDBJNIConnector {
         Long pSql = 0l;
         try {
             pSql = this.executeQueryImp(sql.getBytes(TaosGlobalConfig.getCharset()), this.taos);
+            taosInfo.stmt_count_increment();
         } catch (Exception e) {
             e.printStackTrace();
             this.freeResultSetImp(this.taos, pSql);
@@ -276,9 +271,7 @@ public class TSDBJNIConnector {
             throw new SQLException("Undefined error code returned by TDengine when closing a connection");
         }
         // invoke closeConnectionImpl only here
-        int open = taosInfo.getOpen_count().get();
-        int close = taosInfo.getClose_count().incrementAndGet();
-        System.out.println("open_count: " + open + ", close_count: " + close + ", connection_count: " + (taosInfo.getConnectionCount()));
+        taosInfo.connect_close_increment();
     }
 
     private native int closeConnectionImp(long connection);
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
index e7317b8e1d6eb2744c50a5bf1d106c7b687cc965..402d114215535a517c02c16796ebe4ba7705a741 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
@@ -14,13 +14,15 @@
  *****************************************************************************/
 package com.taosdata.jdbc;
 
+import com.taosdata.jdbc.utils.TaosInfo;
+
 import java.sql.*;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.TimeUnit;
 
 public class TSDBStatement implements Statement {
-    private TSDBJNIConnector connector = null;
+    private TSDBJNIConnector connector;
+    private TaosInfo taosInfo = TaosInfo.getInstance();
 
     /**
      * To store batched commands
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfo.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfo.java
index 83ac7ed809d9d864ba55fc9d79a2306013602421..69a90fe3b378067eda6de0efb2b655d41c49a1da 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfo.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfo.java
@@ -3,12 +3,14 @@ package com.taosdata.jdbc.utils;
 import javax.management.*;
 import java.lang.management.ManagementFactory;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
 
 public class TaosInfo implements TaosInfoMBean {
 
     private static volatile TaosInfo instance;
-    private AtomicInteger open_count = new AtomicInteger();
-    private AtomicInteger close_count = new AtomicInteger();
+    private AtomicLong connect_open = new AtomicLong();
+    private AtomicLong connect_close = new AtomicLong();
+    private AtomicLong statement_count = new AtomicLong();
 
     static {
         try {
@@ -21,23 +23,40 @@ public class TaosInfo implements TaosInfoMBean {
     }
 
     @Override
-    public int getConnectionCount() {
-        return open_count.get() - close_count.get();
+    public long getConnect_open() {
+        return connect_open.get();
     }
 
     @Override
-    public int getStatementCount() {
-        return 0;
+    public long getConnect_close() {
+        return connect_close.get();
     }
 
-    public AtomicInteger getOpen_count() {
-        return open_count;
+    @Override
+    public long getConnect_active() {
+        return connect_open.get() - connect_close.get();
+    }
+
+    @Override
+    public long getStatement_count() {
+        return statement_count.get();
+    }
+
+    /*******************************************************/
+
+    public void conn_open_increment() {
+        connect_open.incrementAndGet();
+    }
+
+    public void connect_close_increment() {
+        connect_close.incrementAndGet();
     }
 
-    public AtomicInteger getClose_count() {
-        return close_count;
+    public void stmt_count_increment() {
+        statement_count.incrementAndGet();
     }
 
+    /********************************************************************************/
     private TaosInfo() {
     }
 
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfoMBean.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfoMBean.java
index 791292e902903f137811699b22b02dd3248983e5..e16f41b2f585244721e923a963c53fb6b7bccf47 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfoMBean.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/TaosInfoMBean.java
@@ -2,7 +2,12 @@ package com.taosdata.jdbc.utils;
 
 public interface TaosInfoMBean {
 
-    int getConnectionCount();
+    long getConnect_open();
+
+    long getConnect_close();
+
+    long getConnect_active();
+
+    long getStatement_count();
 
-    int getStatementCount();
 }